Chiral imprinting in molten gallium

Abstract

Chiral imprinting in molten gallium can be attained by ultrasonic irradiation of molten Ga overlayed by an aqueous solution of D-or L-tryptophan. The products are micro/nanoparticles of Ga encapsulating molecules of one of the enantiomers. After leaching of the enantiomer in pure water, molecular templates are left on the surface of the gallium particles, enabling the entrapment of the specific enantiomer from a solution of the racemate and yielding an enantiomeric excess of 6-12%. The extent of the enantiomeric excess was determined using polarimetry, Chiral HPLC and circular dichroism measurements.

Ga@C-dots as an antibacterial agent for the eradication of <em>Pseudomonas aeruginosa</em>

“…[21][22][23][24] After sonication and separation of the precipitates, the fluorescence emitted from Ga@C-dots in the supernatant solution was recorded at different excitation wavelengths (330, 350, 370, 390, 410, 430, 450, 470, and 490 nm). The results that were obtained from Ga@C-dots which were produced in the presence of different amounts of Ga (70, 175, 350, and 700 mg) were identical to those in our previous reports 21 (data not shown).…”

Chiral Sensing with Mesoporous Pd@Pt Nanoparticles

“…These surfaces have been made by physical methods including laser cutting single‐crystal Pt, or electrodepositing metal films in high magnetic fields . Additionally, several chemical approaches use chiral molecules to direct the surface structure of the substrate . Such material substrates can then be used to discriminate between different enantiomers/stereoisomers electrochemically.…”

Formation of particles of bismuth-based binary alloys and intermetallic compounds by ultrasonic cavitation

“…8 Ternary alloy nanoparticles are of interest as they might, for instance, provide a facile pathway for incorporation of dopants in nanoscale structures such as nanowires and controlled modification of the surface of the nanowires by ordered carbon shells leads to drastic changes in the solubility. [15][16][17] Performing this process in aqueous solutions of metallic ions (Ag, Cu, and Au) that have more positive reduction potentials than gallium resulted in the instantaneous reduction of these ions by Ga and formation of intermetallic compounds (Ag 2 Ga, CuGa 2 and AuGa 2 ) in the form of particles. Formation by laser ablation of bulk alloys was reported by few research groups.…”